摘要
针对装配式混凝土梁-柱节点,提出一种可更换分级屈服耗能连接(replaceable graded-yielding energy-dissipation connector,RGEC),以实现结构屈服损伤可控并增强震后可恢复性。为研究RGEC的疲劳性能、耗能能力等力学性能,对5个试件开展低周往复加载试验。试验结果表明:RGEC具备良好的疲劳性能和稳定的滞回性能,其滞回曲线表现出明显的分级屈服机制;各试件在正常工作阶段的刚度、承载及耗能能力基本稳定,接近破坏时依然保持较充分的性能储备,破坏形式主要表现为弯剪段的弯剪破坏。针对RGEC弯剪段和屈曲段的变形性能,基于ABAQUS软件开展参数分析。结果表明:屈曲段的应变分布不均匀现象随着宽厚比或约束间隙的增大逐渐加重,同时其屈曲波数随宽厚比的增大逐渐增加;弯剪段的变形模式随着等应力屈服高度比或高宽比的减小逐渐由弯曲变形转变为剪切变形。
A kind of replaceable graded-yielding energy-dissipation connector(RGEC) was proposed for prefabricated concrete beam-column joint.The RGEC can control the yield and damage and improve the rehabilitation property of the structure.Low cyclic loading tests on 5 specimens were conducted to study the mechanical properties of the RGEC,such as fatigue performance,energy dissipation capacity,etc.The experimental results indicate that the RGEC have good fatigue performance and stable hysteretic behavior,and the hysteretic curves of the RGEC specimens exhibit a clear graded yielding mechanism.The stiffness,bearing capacity and energy dissipation capacity of the specimens remain stable in the normal working stage,and still have sufficient performance reserve when reaching fatigue failure,and the failure is mainly in the form of bending-shear failure of the bending-shear component.A parametrical analysis was carried out based on ABAQUS for the deformation performance of the bending-shear component and the buckling-constrained component.The results show that the strain uneven distribution is aggravated with the increase of the width-thickness ratio or constraint clearance of the buckling-constrained component,and the buckling wave number is increased with the increase of the width-thickness ratio.The deformation mode changes from bending deformation to shearing deformation with the decrease of yield stress contour height ratio or aspect ratio of the bending-shear component.
作者
李芳玉
杜永峰
李虎
池佩红
LI Fangyu;DU Yongfeng;LI Hu;CHI Peihong(Institute of Earthquake Protection and Disaster Mitigation,Lanzhou University of Technology,Lanzhou 730050,China;International Research Base of Seismic Mitigation and Isolation of Gansu Province,Lanzhou University of Technology,Lanzhou 730050,China)
出处
《振动与冲击》
EI
CSCD
北大核心
2023年第22期49-59,共11页
Journal of Vibration and Shock
基金
国家自然科学基金(51778276,52178291)。
关键词
装配式混凝土框架结构
分级屈服
可更换连接
低周往复荷载试验
疲劳性能
变形性能
prefabricated concrete frame structure
graded yield
replaceable connector
low cyclic loading test
fatigue performance
deformation performance
